<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>05_测试题</title>
</head>

<body>
    <script type="text/javascript">
        function A() {

        }
        A.prototype.n = 1
        var b = new A()
        A.prototype = {
            n: 2,
            m: 3
        }
        var c = new A()
        console.log(b.n, b.m, c.n, c.m);//1,undefined,2,3

        function F() { }
        Object.prototype.a = function () {
            console.log('a()');
        }
        Function.prototype.b = function () {
            console.log('b()');
        }

        var f = new F()
        f.a()
        //f.b()
        F.a()
        F.b()
        // a(),, a(),b()



    </script>
</body>

</html>